4th Grade Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 2 — Answers
Answer sheet with worked solutions for the 4th Grade place value worksheet.
Success TutoringWorksheetsAnswer sheet4th Grade · Mathematics · Place Value4th Grade Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 99 − 32 by rounding each number to the nearest 10.
Answer: 70
- 99 rounds to 100; 32 rounds to 30
- 100 − 30 = 70
The exact answer is 67, close to the estimate.
2.Estimate 68 − 14 by rounding each number to the nearest 10.
Answer: 60
- 68 rounds to 70; 14 rounds to 10
- 70 − 10 = 60
The exact answer is 54, close to the estimate.
3.Estimate 56 + 82 by rounding each number to the nearest 10.
Answer: 140
- 56 rounds to 60; 82 rounds to 80
- 60 + 80 = 140
The exact answer is 138, close to the estimate.
4.Estimate 77 + 51 by rounding each number to the nearest 10.
Answer: 130
- 77 rounds to 80; 51 rounds to 50
- 80 + 50 = 130
The exact answer is 128, close to the estimate.
5.Estimate 73 + 54 by rounding each number to the nearest 10.
Answer: 120
- 73 rounds to 70; 54 rounds to 50
- 70 + 50 = 120
The exact answer is 127, close to the estimate.
6.Estimate 87 + 96 by rounding each number to the nearest 10.
Answer: 190
- 87 rounds to 90; 96 rounds to 100
- 90 + 100 = 190
The exact answer is 183, close to the estimate.
7.Estimate 24 + 82 by rounding each number to the nearest 10.
Answer: 100
- 24 rounds to 20; 82 rounds to 80
- 20 + 80 = 100
The exact answer is 106, close to the estimate.
8.Estimate 41 − 18 by rounding each number to the nearest 10.
Answer: 20
- 41 rounds to 40; 18 rounds to 20
- 40 − 20 = 20
The exact answer is 23, close to the estimate.
9.Estimate 33 + 85 by rounding each number to the nearest 10.
Answer: 120
- 33 rounds to 30; 85 rounds to 90
- 30 + 90 = 120
The exact answer is 118, close to the estimate.
10.Estimate 54 + 87 by rounding each number to the nearest 10.
Answer: 140
- 54 rounds to 50; 87 rounds to 90
- 50 + 90 = 140
The exact answer is 141, close to the estimate.
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.